We have a Weinig Unimat Gold 6 head moulder. We have been having issues with wider lumber travelling away from the fence. We have checked out operating manual and it says if this is happening it may be due to the infeed wheels not being centered over the wood. So, we have made sure we have the feed wheels centered over the wood but we are still having problems.
We have confirmed a 3 degree cant on our shafts that the infeed rollers are mounted to; this cant is supposed to keep the wood tight to the fence but yet it wanders. Does anyone have any suggestions?
(Architectural Woodworking Forum)
From contributor B:
My first place to look would be the right side heads. Make sure the cutters are inline with the outfeed fence. We did not like the left side fences on our Profimat so we made a new beefy fence which bolted to the table after the last head. By keeping all of the left side fences fairly tight you should not have a problem.
We were taught by Weinig during our in-house training to use the reading of the head from our ATS Measuring stand; we have found however it is much more accurate to set the radial axis of the right head by using a straight edge to the outfeed fence. We do the same thing on the last bottom head if we have our 20 thou shim in. We raise the last bottom head just until it barely scrapes the straight edge so we know it is perfectly lined up with the table.
Also, I couldn't agree more with your thoughts on the left fence; we hate ourís and have thought right from the get-go that we need to re-design something much better than that. It has also been mangled a few times; if it is not out far enough and the new piece of stock coming through catches on it, it bends it like a pretzel! But what is strange is that that happens but then at other times the piece of wood sticks and you can't make it go through the moulder. We have had the machine in operation since August 2007; we have learned a lot but still have more to learn I am sure.
One thing I have noticed is that the most difficult challenge in moulder operation is the balancing act between the pressure system and the feed system. If you have too much pressure (to overcome chatter) then the pieces get stuck; if you don't have less pressure (to overcome feeding issues) you get chatter.
Thanks again so much for your post!
We have had to take a mason string line and stretch it through the moulder twice now to re-align the infeed fence of the moulder, the one that we move in and out during operation. It seems if that thing is not lined up perfectly you have huge problems with the wood travelling away.
We use this masons string line because we do not have a large straight edge. It does seem to work.
Regarding the straightness of the boards, we do joint one edge of the boards first then we rip them 1/4" to 5/16" over the finished width. We generally have the crown out so that the Unimat can straighten the boards as they go in; from what I understand the moulder acts as a jointer as well to straighten the pieces as they go in. To answer your question though for the most part our blanks are relatively straight going in.
As per your example, it would seem that the "L" would be lying down with the long part laying and the short part pointing straight up. As the rollers turn clockwise, then the short part of the "L" would get to the wood before the long part of the "L". Is this correct?